http://lists.w3.org/Archives/Public/public-html/2011Aug/0033.html
W3C is like PKIX working with the idea of upgrading existing schemes
rather than starting with a requirement specification and see where
that leads you.
I don't think W3C's revised <keygen> will go anywhere because a 2-phase
protocol doesn't really cut it. Apple's already deployed scheme for iPhone
is considerably more powerful and user-friendly.
Anders